strongSwan 5.9.8 and 5.9.9 potentially allows remote code execution because it uses a variable named "public" for two different purposes within the same function. There is initially incorrect access control, later followed by an expired pointer dereference. One attack vector is sending an untrusted client certificate during EAP-TLS. A server is affected only if it loads plugins that implement TLS-based EAP methods (EAP-TLS, EAP-TTLS, EAP-PEAP, or EAP-TNC). This is fixed in 5.9.10.

An update of the strongswan package has been released.

The remote host is affected by the vulnerability described in GLSA-202405-08 (strongSwan: Multiple Vulnerabilities)

  - The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving     many requests with different certificates to fill the cache and later trigger the replacement of cache     entries. The code attempts to select a less-often-used cache entry by means of a random number generator,     but this is not done correctly. Remote code execution might be a slight possibility. (CVE-2021-41991)

  - In strongSwan before 5.9.5, a malicious responder can send an EAP-Success message too early without     actually authenticating the client and (in the case of EAP methods with mutual authentication and EAP-only     authentication for IKEv2) even without server authentication. (CVE-2021-45079)

  - strongSwan before 5.9.8 allows remote attackers to cause a denial of service in the revocation plugin by     sending a crafted end-entity (and intermediate CA) certificate that contains a CRL/OCSP URL that points to     a server (under the attacker's control) that doesn't properly respond but (for example) just does nothing     after the initial TCP handshake, or sends an excessive amount of application data. (CVE-2022-40617)

  - strongSwan 5.9.8 and 5.9.9 potentially allows remote code execution because it uses a variable named     public for two different purposes within the same function. There is initially incorrect access control,     later followed by an expired pointer dereference. One attack vector is sending an untrusted client     certificate during EAP-TLS. A server is affected only if it loads plugins that implement TLS-based EAP     methods (EAP-TLS, EAP-TTLS, EAP-PEAP, or EAP-TNC). This is fixed in 5.9.10. (CVE-2023-26463)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 37 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2023-25800591ef advisory.

    Update to 5.9.10 for CVE-2023-26463

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 38 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2023-9fb10d880d advisory.

    Update to 5.9.10 for CVE-2023-26463

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 3f9b6943-ba58-11ed-bbbd-00e0670f2660 advisory.

  - strongSwan reports: A vulnerability related to certificate verification in TLS-based EAP methods     was discovered in strongSwan that results in a denial of service              but possibly even remote     code execution. Versions 5.9.8 and 5.9.9              may be affected.  (CVE-2023-26463)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
204210	Photon OS 5.0: Strongswan PHSA-2023-5.0-0010	Nessus	PhotonOS Local Security Checks	critical
203572	Photon OS 4.0: Strongswan PHSA-2023-4.0-0366	Nessus	PhotonOS Local Security Checks	critical
194978	GLSA-202405-08 : strongSwan: Multiple Vulnerabilities	Nessus	Gentoo Local Security Checks	critical
172470	Fedora 37 : strongswan (2023-25800591ef)	Nessus	Fedora Local Security Checks	critical
172459	Fedora 38 : strongswan (2023-9fb10d880d)	Nessus	Fedora Local Security Checks	critical
172105	FreeBSD : strongSwan -- certificate verification vulnerability (3f9b6943-ba58-11ed-bbbd-00e0670f2660)	Nessus	FreeBSD Local Security Checks	critical

Detections

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CVE-2023-26463

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critical